The top 10 most-valued firms lost a cumulative Rs 4,986 crore in market valuation on Tuesday.SBI witnessed the steepest decline among the top 10 most-valued firms, with a loss of Rs 8,121 crore in market cap.Infosys saw a reduction of Rs 6,332 crore in its market cap.Reliance Industries Ltd. and ICICI Bank Ltd. gained Rs 608 crore and Rs 1,514 crore in market capitalization, respectively.